Create separete dockerfiles for services

db.Dockerfile

@@ -0,0 +1 @@
+FROM mysql:5

docker-compose.yml

@@ -6,7 +6,7 @@ services:
   cms:
     build:
       context: .
-      dockerfile: ./Dockerfile
+      dockerfile: ./cms.Dockerfile
     networks:
       - nuth
     ports:
@@ -14,7 +14,9 @@ services:
     depends_on: 
       - db
   db:
-    image: mysql:5
+    build:
+      context: .
+      dockerfile: ./db.Dockerfile
     networks:
       - nuth
     ports: